Mattityahu 23:9-11

Orthodox Jewish Bible

⁹ And do not refer to anyone in the Olam Hazeh as your Abba, for One is your Av shbaShomayim.

¹⁰ Neither be called Moreinu, for One is your Moreh (teacher) the Rebbe, Melech HaMoshiach [Moreinu].

¹¹ And the greatest among you will be your eved mesharet (servant, minister).